I am looking for a quote from a past President of the United States about judging a nation based on the way it treats it's elders? I want to say it was FDR but I'm n ot sure.

This quote sounds a lot like what you are looking for, although it's from a "near" President, not an elected one:

"It was once said that the moral test of government is how that government treats those who are in the dawn of life, the children; those who are in the twilight of life, the elderly; and those who are in the shadows of life, the sick, the needy and the handicapped." -- Hubert H. Humphrey

There were many public statements made by Roosevelt during his presidency regarding the financial security of American citizens. Upon the signing of The Social Security Act in 1935 Roosevelt made this statement:

"We can never insure 100% of the population against 100% of the hazzards and vicissitudes of life. But we have tried to frame a law which will give some measure of protection to the average person against the loss of a job and against poverty ridden old-age"

Roosevelt does make the suggestion that prior to this New Deal legislation, America did not have much regard for its elderly nor cared for their financial security.